608 W average power picosecond all fiber polarization-maintained amplifier with narrow-band and near-diffraction-limited beam quality
608 W average power picosecond all fiber polarization-maintained amplifier with narrow-band and near-diffraction-limited beam quality
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DOI：
10.1088/2040-8978/17/7/075501
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发表时间：
2015-07
影响因子：
2.1
通讯作者：
P. Ma;R. Tao;Long Huang;Xiao-lin Wang;P. Zhou;Zejin Liu
中科院分区：
文献类型：
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作者：
P. Ma;R. Tao;Long Huang;Xiao-lin Wang;P. Zhou;Zejin Liu
在本文中，我们重点研究了一种窄带全光纤保偏（PM）主振荡器功率放大器（MOPA）配置，该配置由窄带增益开关激光二极管播种，通过控制有害模式不稳定性（MI）效应，用于亚纳秒脉冲状态下的近衍射限制平均功率缩放。实验研究了不同泵浦波长的MOPA系统的无MI平均功率缩放能力。用976 nm激光二极管泵浦主放大器，实验结果表明，由于MI效应的影响，近衍射限制平均功率仅为380 W左右。然而，通过选择915 nm的泵浦波长，脉冲宽度为~ 810 ps，峰值功率为~ 128 kW，脉冲能量为60.8 μJ，实现了608 W的无模不稳定性平均功率。在608 W的平均功率下，整个MOPA配置的3 dB线宽约为0.19 nm。在最大输出功率下，光束质量（M2因子）和偏振消光比（PER）分别在1.4 dB和13 dB以内。
In this manuscript, we focus on a narrow-band all fiber polarization-maintained (PM) master oscillator power amplifier (MOPA) configuration seeded by a narrow band gain-switched laser diode for near-diffraction-limited average power scaling in sub-nanosecond pulsed regime by controlling detrimental mode instability (MI) effect. The MI free average power scaling abilities of the MOPA system with different pumping wavelengths are explored experimentally. By pumping the main amplifier with 976 nm laser diodes (LDs), experimental results show that near-diffraction-limited average power is just limited to be about 380 W due to the influence of MI effect. However, by selecting a 915 nm pumping wavelength, a mode-instability free average power of 608 W is achieved with pulse width of ∼810 ps, peak power of ∼128 kW and pulse energy of 60.8 μJ. At 608 W average power, the 3 dB line-width of the whole MOPA configuration is measured to be about 0.19 nm. The beam quality (M2 factor) and polarization extinction ratio (PER) at maximal output power are measured to be within 1.4 and 13 dB, respectively.